Sink



FIG. 1 is a side, top perspective view of a sink showing my new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a right, top perspective view thereof;

FIG. 5 is a greatly enlarged detail view of the lower right corner thereof; and,

FIG. 6 is a greatly enlarged detail view of the upper right corner thereof.

Plumbing holes shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sink, as shown and described. 